SOHC.co.uk Forums > CB350/400

Cylinder stud too short!!

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Nurse Julie:
You are correct Nigel, the studs should not be torqued, just 'nipped' up. There is no torque setting for them in the manuals. Trig says there is no thread lock or similar used on the studs. I think they are so very tight because of the corrosion and they are somewhat 'springy' when you try to turn them to get them out.
If Foggy measured the studs before putting them in and they were all the correct length, this can only mean that a stud has broken through the casing by 5 mm, so may need investigating further when he gets the stud out.

Fogdevil:
Thanks everybody.

This morning I was hoping I could do an easy fix/bodge but you have all convinced me that is not the way to go.I need to get the stud out,examined and check for any damage below.

It is a right royal pain but hey-ho.I've absorbed a lot of info and learnt new tips.

I will let you know how I get on.

Cheers   Foggy

K2-K6:
Yes,  that was my fear as your first post pointed out. If it's the correct stud and the case is damaged, it's certainly a different problem.

I suppose it's not included in manuals as it's generally not a serviceable routine to remove the studs. When I've removed them I've been convinced that the dry powder that comes out is thread lock though. The design seems to call for that from an idealistic point of view, and they never ever release when undoing the head bolts as far as I've found. I just don't think you'd get that consistency if it was plain corrosion.

Fingers crossed that it's an odd stud and no damage done.

Edit,  I was responding to Julie and my post came in after yours Foggy.

Orcade-Ian:
I find it difficult to believe that a correctly dimensioned stud - length, diameter and shoulder could be forced into the crank case top accidentally, especially by an engineering company worthy of the name.  Hope it ends with a good result with minimum effort and cost.

Ian

Just noticed you are in Chorley - are you a Central Lancs VJMC member by any chance?

Nurse Julie:
Yes, fingers crossed for an easy, swift outcome Foggy.

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